Active Hexose Correlated Compound. Increases Natural Killer Cell Activity. AHCC (Active Hexose Correlated Compound) is a proprietary compound produced by cultivation and enzymatic modification of several species of mushroom mycelia including shitake grown in rice bran extract. Considered a super food supplement in Japan AHCC has been researched extensively for its immune enhancement properties. According to human and animal research AHCC may significantly increase Natural Killer (NK) Cell activity. AHCC may also increase macrophage activity enhance cytokine production and support the healthy functioning of the liver as well as act as an antioxidant.